What is UPC ?
UPC –stand for Universal product code. it is a unique code against every product of you if you are doing private label. it is 13 digit code you buy it from different websites you will get certificate as well that this company or brand purchased this UPC. most commonly used in North American region.
What is EAN ?
EAN – stand for European Article Number. its almost the same as UPC but in Europe you have to use EAN instead of UPC. this is also to identify your product.
What is SKU ?
SKU –stand for Stock Keeping Unit – this term use to identify different variations of your product. suppose you are selling a knife and you have 5 different sizes of your knife, 6 inch, 8 inch, 10 inch, 12 inch, 15 inch. and how amazon or you will differentiate that someone wants an 8 inch or 15 inch knife. so you will create an SKU against each variation. Simple words sku means nick name